When, where, and by who was the first submersible used for deep water exploration?

Bottle deposit programs are one way to encourage higher recycling rates. explain how they work

One of the brightest comets of the 20th century was comet hyakutake, which passed close to the sun in early 1996. the orbital period of this comet is estimated to be about 30,000 years. find the semi-major axis of this comet’s orbit. compare it to the average sun-pluto distance and to the distance to alpha centauri, the nearest star to the sun, which is 4.3 light-years distant.

The coco river is a natural border between nicaragua and which other country